A convicted killer has been found guilty of murder once again for the 2009 fatal stabbing of his wife -- who was also a convicted murderer.

A B.C. Supreme Court judge found Thomas Robert Elton guilty of second-degree murder Friday for stabbing 59-year-old Brenda Turcan to death in a Surrey apartment on June 22, 2009.

"This is a successful day for IHIT investigators as it puts this previously convicted killer behind bars again," Sgt. Jennifer Pound of the Integrated Homicide Investigation Team said in a release.

Elton and Turcan were both out on parole at the time of the stabbing after serving time in jail for unrelated murder convictions, and police have described them as outspoken advocates for prisoners' rights.

Elton was just 21 years old when he killed a fellow inmate at Matsqui Penitentiary in Abbotsford in 1975.

Turcan, who was also known as Brenda Blondell, was convicted of second-degree murder in 1987 after prosecutors successfully argued that she had killed her lesbian lover. Turcan and another woman strangled Mya Kulchyski and then sexually assaulted her to make it look like she had been raped, according to court documents.